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Effects of vortex generator on cylindrical protrusion aerodynamics
Springer Science and Business Media LLC - Tập 25 - Trang 7-12 - 2016
Experimental and numerical studies were carried out to evaluate the effect of vortex generator on a small cylindrical protrusion at Mach number 2.0. The experiments were performed using the supersonic blow down wind tunnel on different heights of cylindrical protrusion with vortex generator placed ahead of them. The upstream and downstream flow around the cylindrical protrusion is influenced by vo......
Influence of Endwall Air Injection with Discrete Holes on Corner Separation of a Compressor Cascade
Springer Science and Business Media LLC - Tập 30 - Trang 1684-1704 - 2021
The aim of this study is to reveal the influence mechanism of endwall air injection with distributed holes on the corner separation of a highly loaded compressor cascade, so as to promote the application of injection in aero-engines. Single-hole and double-hole endwall injection schemes featuring different axial locations, pitchwise locations, injection mass rates and injection directions, were de......
Effect of non-equilibrium condensation of moist air on flow field in Ludwieg tube
Springer Science and Business Media LLC - Tập 11 - Trang 104-113 - 2002
The time-dependent behavior of non-equilibrium condensation of moist air through a Ludwieg tube with a diaphragm downstream is investigated by using a computational fluid dynamics work. The two-dimensional, compressible, Navier-Stokes equations, fully coupled with the condensate droplet growth equations, are numerically solved by a third-order MUSCL type TVD finite-difference scheme with a second-......
New type of basic functions of FEM in application to solution of inverse heat conduction problem
Springer Science and Business Media LLC - Tập 11 - Trang 163-171 - 2002
The work presents the application of heat polynomials for solving an inverse problem. The heat polynomials form the Treffetz Method for non-stationary heat conduction problem. They have been used as base functions in Finite Element Method. Application of heat polynomials permits to reduce the order of numerical integration as compared to the classical Finite Element Method with formulation of the ......
Cyclohexane Dehydrogenation in Solar-Driven Hydrogen Permeation Membrane Reactor for Efficient Solar Energy Conversion and Storage
Springer Science and Business Media LLC - Tập 30 - Trang 1548-1558 - 2021
Cyclohexane dehydrogenation in the solar-driven membrane reactor is a promising method of directly producing pure hydrogen and benzene from cyclohexane and storing low-grade solar energy as high-grade chemical energy. In this paper, partial pressure of gases, conversion rate of cyclohexane, and energy efficiency of the reactor are analyzed based on numerical simulation. The process of cyclohexane ......
Diagnosis and Design Improvement of the Internal Flow Field in an Automotive Cooling Fan Based on Boundary Vorticity Dynamics, Part I: Blade Profile Scaling and Rotation
Springer Science and Business Media LLC - Tập 31 - Trang 2411-2423 - 2022
To optimize the aerodynamic performance of the automobile cooling fan (ACF), the internal flow field of the original fan was numerically simulated. According to the theory of boundary vorticity dynamics (BVD), the distribution laws of the boundary vorticity flux (BVF) on the blade surface and the circumferential vorticity (CV) at the wake plane of the fan were analyzed, and the underlying various ......
Acoustic wave prediction in flowing steam-water two-phase mixture
Springer Science and Business Media LLC - Tập 3 Số 3 - Trang 147-154 - 1994
The transient two-fluid model has been used to develop a general relation for acoustic waves. The analysis is valid in principle over the whole void fraction region. Flow pattern transitions from one flow regime to the other are assumed to occur at certain void fractions. Different correlations are used to calculate the interfacial area and interfacial drag force per unit mixture volume for bubbly......
Numerical Investigation on Dropwise Condensation on Rough Structures with and without Non-Condensable Gas
Springer Science and Business Media LLC - Tập 31 - Trang 308-317 - 2022
The geometrical dimensions of the rough structures as well as the non-condensable gases in the vapor mixture can have the great effect on the nucleation position and the wetting state of the droplet, which further influence the condensation heat flux. In this paper, the multispecies multiphase lattice Boltzmann method together with a thermal phase change model is used to investigate the dropwise c......
Experimental Analysis on Influencing Factors of NOx emission in Gas-Fired Heating and Hot Water Combi-Boilers
Springer Science and Business Media LLC - Tập 30 - Trang 1151-1159 - 2020
To study the influencing factors of NOx emission in gas-fired heating and hot water combi-boilers, a boiler with the maximum heat input of 26.0 kW was selected, and influencing factors including flue restrictor diameter, fan power, nozzle aperture, nozzle ejection distance and air relative humidity on NOx formation were determined. The NOx test rig has been built and the concentration of NOx at th......
Structure, Characterization and Thermal Properties of the Form-Stable Paraffin/High-Density Polyethylene/Expanded Graphite/Epoxy Resin Composite PCMs for Thermal Energy Storage
Springer Science and Business Media LLC - Tập 32 - Trang 2104-2114 - 2023
The form-stable paraffin/high-density polyethylene/expanded graphite/epoxy resin composite phase change materials (CPCMs), exhibiting suitable thermal properties, including low melting temperature, high conductivity and high phase change enthalpy, was developed in this work. Herein, paraffin (PA) was utilized as a core PCM. High-density polyethylene (HDPE) was utilized for the shape stabilization ......
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